DSP has been so widely used a concept that general purpose processors are also incorporating features to support digital signal processing more efficiently.
DSP are special purpose microprocessors for signal processing
Clock speed: 100-200 MHz
• 16-bit (fixed point) or 32-bit (floating point)
buses and word sizes
• 16-24 bit address space
• Some on-chip memory
• Single-cycle execution of most instructions
• 12-16 instructions
• Single-cycle execute
RISC are microprocessors for usually generic usage